#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include "syscall.h"

void __procfdname(char*, unsigned);

int fchdir(int fd) {
  int ret = __syscall(SYS_fchdir, fd);
  if (ret != -EBADF || __syscall(SYS_fcntl, fd, F_GETFD) < 0)
    return __syscall_ret(ret);

  char buf[15 + 3 * sizeof(int)];
  __procfdname(buf, fd);
  return syscall(SYS_chdir, buf);
}